#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)
#define range(a) a.begin(), a.end()

int main() {
  int A, B, C; cin >> A >> B >> C;
  int ans = 2e9;
  ans = min(ans, abs(B - A));
  ans = min(ans, abs(C - A));
  ans = min(ans, abs(C - B));
  cout << ans << endl;
}